XIAO BLE Sense - LSM6DS3 INT1 Single Tap Interrupt

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XIAO BLE Sense - LSM6DS3 INT1 Double Tap Interrupt Xiao Expansion Board OLED TAP DEMO
/*****************************************************************************/

// IMU Interrupt Example for XIAO BLE Sense

// This example shows how to configure LMSD6S3TR-C on XIAO BLE SENSE to interrupt

// on INT1 after a “Double Tap” was recognized.

// Additionally, the device goes into System OFF state, after 5 interrupts were

// received. Another “Double Tap” will wake up the device again.

//

// Original by chuck

Go See it running HERE------>>>Expansion Board TAP DEMO video

20221008_221650
20221008_2216501920×1920 206 KB

20221008_235124
20221008_2351241920×1920 235 KB

HTG
GL :slight_smile:

/*****************************************************************************/
// IMU Interrupt Example for XIAO BLE Sense
// This example shows how to configure LMSD6S3TR-C on XIAO BLE SENSE to interrupt
// on INT1 after a "Double Tap" was recognized.
// Additionally, the device goes into System OFF state, after 5 interrupts were
// received. Another "Double Tap" will wake up the device again.
// 
// Original by chuck
//poatched and toasted by pjg
/*******************************************************************************/

#include "LSM6DS3.h"
#include "Wire.h"
#include <U8x8lib.h>
LSM6DS3 myIMU(I2C_MODE, 0x6A); // IMU 
#define int1Pin PIN_LSM6DS3TR_C_INT1

U8X8_SSD1306_128X64_NONAME_HW_I2C u8x8(/* clock=*/ PIN_WIRE_SCL, /* data=*/ PIN_WIRE_SDA, /* reset=*/ U8X8_PIN_NONE);
 // OLEDs without Reset of the Display

const int buttonPin = 1;     // the number of the pushbutton pin
int buttonState = 0;         // variable for reading the pushbutton status
int BuzzerPin = A3;
uint8_t interruptCount = 0; // Amount of received interrupts
uint8_t prevInterruptCount = 0; // Interrupt Counter from last loop


void setup() {
    Serial.begin(9600);
	  delay(1000); //relax...
	  Serial.println("Processor came out of reset.\n");
    u8x8.begin();
    u8x8.setFlipMode(1);   // set number from 1 to 3, the screen word will rotary 180
    
    pinMode(LED_BUILTIN, OUTPUT);// initialize the LED pin as an output:
    pinMode(buttonPin, INPUT_PULLUP);// initialize the pushbutton pin as an input:
    pinMode(BuzzerPin, OUTPUT);
    pinMode(LEDR, OUTPUT);
    pinMode(LEDG, OUTPUT);
    pinMode(LEDB, OUTPUT);
    setLedRGB(false, false, true); // set blue led

    myIMU.settings.gyroEnabled = 0; // Gyro currently not used, disabled to save power 
    if (myIMU.begin() != 0) {
        Serial.println("IMU error");
    } else {
        Serial.println("IMU OK!");
    }
    
    setupDoubleTapInterrupt();
    
    pinMode(int1Pin, INPUT);
    attachInterrupt(digitalPinToInterrupt(int1Pin), int1ISR, RISING);
    u8x8.setFont(u8x8_font_8x13B_1x2_r);
    u8x8.clearDisplay();
    u8x8.setCursor(0, 0);
    u8x8.print("Tap Demo");
  
}

void loop() {
    setLedRGB(false, false, true); // reset led to blue only
    u8x8.setCursor(0, 3);
    u8x8.print(interruptCount);
    Serial.print("\Iterrupt Counter: ");
    Serial.println(interruptCount);

    // if interrupt was received in this cycle
    if (interruptCount > prevInterruptCount) {
      Serial.println("\Interrupt received!");
      setLedRGB(false, true, false); // set green only
    }
    
    prevInterruptCount = interruptCount;
    
    if (interruptCount >= 5) {
      // Trigger System OFF after 5 interrupts
      goToPowerOff();
    }
    
    delay(500);
}


// -------------------- System ------------------------- //

void goToPowerOff() {
  setLedRGB(false, false, false);
  Serial.println("Going to System OFF");
  u8x8.clearDisplay();
  u8x8.setCursor(0, 3);
  u8x8.print("SLEEP");
  setupDoubleTapInterrupt(); // not needed here, if already applied..
  delay(1000); // delay seems important to apply settings, before going to System OFF
  //Ensure interrupt pin from IMU is set to wake up device
  nrf_gpio_cfg_sense_input(digitalPinToInterrupt(int1Pin), NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);
  // Trigger System OFF
  NRF_POWER->SYSTEMOFF = 1;
}

// -------------------- Interrupts ------------------------- //

void setupDoubleTapInterrupt() {
  uint8_t error = 0;
  uint8_t dataToWrite = 0;

  // Double Tap Config
  myIMU.writeRegister(LSM6DS3_ACC_GYRO_CTRL1_XL, 0x60); //* Acc = 416Hz (High-Performance mode)// Turn on the accelerometer
  // ODR_XL = 416 Hz, FS_XL = 2g
  myIMU.writeRegister(LSM6DS3_ACC_GYRO_TAP_CFG1, 0x8E);// INTERRUPTS_ENABLE, SLOPE_FDS// Enable interrupts and tap detection on X, Y, Z-axis
  myIMU.writeRegister(LSM6DS3_ACC_GYRO_TAP_THS_6D, 0x85);// Set tap threshold 8C
  myIMU.writeRegister(LSM6DS3_ACC_GYRO_INT_DUR2, 0x7F);// Set Duration, Quiet and Shock time windows 7F
  myIMU.writeRegister(LSM6DS3_ACC_GYRO_WAKE_UP_THS, 0x80);// Single & double-tap enabled (SINGLE_DOUBLE_TAP = 1)
  myIMU.writeRegister(LSM6DS3_ACC_GYRO_MD1_CFG, 0x08);// Double-tap interrupt driven to INT1 pin
}

void int1ISR()
{
  interruptCount++;
 ;
  
}

// -------------------- Utilities ------------------------- //

void setLedRGB(bool red, bool green, bool blue) {
  if (!blue) { digitalWrite(LEDB, HIGH); } else { digitalWrite(LEDB, LOW); }
  if (!green) { digitalWrite(LEDG, HIGH); } else { digitalWrite(LEDG, LOW); }
  if (!red) { digitalWrite(LEDR, HIGH); } else { digitalWrite(LEDR, LOW); }
}
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